Replacing a disk unit

If you must replace a failed disk unit or exchange a disk unit to prevent failure, the Replace Disk Unit wizard makes the process a simple task.

The disk unit to be replaced or exchanged must be running with either mirrored protection or device parity protection. To replace a mirrored disk unit, you must first suspend mirroring. A disk unit that is running with device parity protection can be exchanged only if it failed. A disk unit with device parity protection cannot be replaced with a non-configured disk even if it failed.

To replace a failed disk unit or exchange a suspended mirrored disk unit, follow these steps:

  1. Start System Service Tools (STRSST), and specify the user name and password.
  2. On the System Service Tools (SST) display, select Work with Disk Units.
  3. On the Work with Disk Units display, select Work with disk unit recovery.
  4. On the Work with Disk Unit Recovery display, select Replace configured unit.
  5. On the Select Configured Unit to Replace display, select the configured unit.
  6. On the Select Replacement Unit display, select the non-configured disk unit.
  7. On the Confirm Replace of Configured Unit display, press Enter to confirm your choice.